Thanks for the feedback guys. I'm not really worried about playing Skyrim on it. This is more for my kids, and the games they would play.
I found this case on NewEgg (where I was already looking).
http://www.newegg.com/Product/Product.a ... 6811121100It is 4" tall and just under 14" wide. So it should fit fine, and already comes with a 300W power supply. All for $60. It only accepts Micro-ATX motherboards. For the price of the case+PSU, I'd spend the money on the new motherboard.
In all there are a few here that are under 4" and have a PSU. Since I'm only going for the APU with no external GPU, I figure these are good enough. And bring the build cost way down.
http://www.newegg.com/Product/ProductLi ... rchInDesc=If I am going to look at Blu-Ray support, what do you recommend for playback software? I tried using AnyDVD from Slysoft and VLC, but it was less than 1fps. When I look at most of the commercial playback software, it alone is $50 - $75. A cheap mini BD player is only $80. We don't want disks often, but I do have the HP, LOTR, Star Wars and James Bond collections. Rather than moving the whole HTPC, I could just move the mini BD when I needed.
Without the Blu-Ray I'm at a recommended PSU wattage of 176W. If I dropped to the ITX motherboard (and hopped I didn't get a DOA one), I could use this case from Lian-Li -
http://www.newegg.com/Product/Product.a ... 6811112361Also, looks like I could go with an A75 board (which had better rating), as the differences to A85X are minimal -
http://hexus.net/tech/reviews/cpu/46005 ... inity-apu/